CN105241883A - Printer pattern online detection and color division method - Google Patents
Printer pattern online detection and color division method Download PDFInfo
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Abstract
The present invention discloses a printer pattern online detection and color division method. According to the method, an industrial flat plate computer and a light source are required to be arranged, a proximity sensors and an industrial camera are arranged on the terminal end of a printing process, and when the complete printed finished product arrives, the industrial camera is triggered to shoot and the image is sent to the industrial flat plate computer; image shape and color division treatment is performed in the industrial flat plate computer, and the principal component analysis (PCA) is based and the new image color division algorithm of the existing color image division algorithm is combined; and the real-timely divided image and the standard image stored in the industrial flat plate computer are compared to obtain the shape difference and the color difference between the printed real-time image and the standard image, and the synchronization controller is designed for ensuring the synchronization among the printing process, the camera shooting and the computer treating. With the printer pattern online detection and color division method of the present invention, the fault diagnosis of online color concentration control, pattern shape and other printing quality can be achieved.
Description
Technical field
The present invention relates to the technical field that printing images detects, refer in particular to a kind of method of printing machine pattern on-line checkingi and color segmentation, on-line checkingi and color segmentation can be carried out to the image of the printed matter after printing.
Background technology
The quality of printing quality well can be reflected from the image of printed matter; by detecting the image of printed matter in real time and extracting its picture shape and be partitioned into change and the fault diagnosis that color can detect the controling parameters of certain link in printing process; on line real time control can be carried out for printing quality parameter a such as color density etc.; for the parameter cannot carrying out online controlling in real time; fault alarm and fault diagnosis can be carried out; even maintenance down; reduce the loss that fault is brought, and convenient for maintaining.The prerequisite of all these is exactly, and needs to carry out online printed matter image and detects and color segmentation, extract correlation parameter, thus provide the automatization level of printing machine, ensure printing quality.
Summary of the invention
In order to realize the fault diagnosis of the printing qualities such as the control of online color density and pattern form, needing to carry out image detection and color segmentation to the printed matter of printing process, the present invention proposes a kind of method of printing machine pattern on-line checkingi and color segmentation.
For achieving the above object, technical scheme provided by the present invention is: a kind of method of printing machine pattern on-line checkingi and color segmentation, first, the industrial tablet computer and lighting source with communication and image-capable need be configured with, and at the end of printing process, proximity transducer and industrial camera are installed, when complete printing finished product arrives, trigger industrial camera and take pictures, obtain printing finished product image, and this image is passed to industrial tablet computer, picture shape and color segmentation process is carried out in industrial tablet computer, to adopt based on principal component analysis (PCA) PCA and in conjunction with the new images color segmentation algorithm of existing Segmentation of Color Image, this algorithm is: first utilize PCA algorithm to be main characteristic component and residual characteristic component two component map picture breakdown, then secondary watershed algorithm is adopted to split residual characteristic component figure, utilize K-Means algorithm to carry out cluster to main characteristic component figure just to split, then the image after just splitting cluster carries out analogous color area merges, finally the carrying out of two component map after segmentation is merged, obtain final segmentation result figure, then after the image after Real-time segmentation and the standard picture be stored in industrial tablet computer being contrasted, obtain printing realtime graphic and the difference of standard picture in shape and color, for follow-up printing quality fault diagnosis and color density control to provide foundation in real time, in order to ensure printing process, camera takes pictures and synchronous between computer disposal three, devise isochronous controller, isochronous controller is communicated with industrial tablet computer by RS422 communication interface, obtains image processing software duty and camera status is informed image processing software, isochronous controller is by printed matter proximity state in proximity transducer perception printing process, and the duty of combining image process software determines that whether triggering camera takes pictures, isochronous controller triggers camera by the I/O way of output and takes pictures, and obtains camera duty, and camera duty is informed image processing software by RS422 mode by I/O input mode, isochronous controller controls lighting source by power switch circuit, industrial camera adopts 1000M Ethernet to communicate with industrial tablet computer, realizes image data transmission, in order to improve image acquisition and image processing speed, have employed multi-thread mechanism and making industrial tablet computer and industrial camera concurrent working, in conjunction with synchronization mechanism, with applicable different printing machine type and different printing speed.
Described industrial tablet computer adopts the Duo double-core industrial panel computer PPC-177T grinding China, and have 1000M Ethernet and RS422 interface, frequency of operation is up to 2.16MHz; Described industrial camera adopts the colored industrial camera SXG21C of fort alliance, has 1920 × 1080 resolution; Described lighting source is D65 standard sources, controls lighting source by isochronous controller by power switch circuit; Described isochronous controller, by the arrival of proximity transducer perception printing finished product, is communicated with industrial tablet computer by RS422, realizes the synchronous of industrial camera and industrial tablet computer; Described isochronous controller triggers industrial camera and takes pictures and obtain industrial camera by exporting I/O and to take pictures done state signal; Described industrial tablet computer is communicated with industrial camera by 1000M Ethernet, obtains printed matter view data, the Time delay arranging industrial camera and these running parameters of time shutter.
Shooting trigger signals allowed by running parameter configuration and the computing machine of described isochronous controller reception industrial tablet computer, receive running parameter before printing process, described industrial tablet computer is initial synchronization controller and industrial camera first, these running parameters of triggered time between configuration printing finished product arrives and takes pictures, lighting source opened by isochronous controller; In printing process, isochronous controller is by the arrival of its proximity transducer perception printing finished product, and the single chip circuit of isochronous controller adopts the STM32F100C8 based on Cortex-M3 kernel.
Compared with prior art, tool has the following advantages and beneficial effect in the present invention:
1, the printing process print quality inspection method based on machine vision is adopted, for the control of subsequent color concentration and printing process fault diagnosis provide basic data, the closed-loop control of color density can improve printing quality and print speed printing speed, and printing process fault diagnosis reduces rejection rate, improves maintenance of equipment efficiency.
2, adopt isochronous controller perception printing finished product close to and control criterion light illumination, coordinate printing process, synchronous between industrial camera and industrial tablet computer, be applicable to different print speed printing speeds, make image data acquiring and data processing concurrent working simultaneously, improve systems axiol-ogy efficiency.
3, adopt the illumination of D65 standard sources fluorescent tube, reduce light source to the influence of color of photochrome.
4, make full use of the number of colours Given information of standard picture, to the initial value that realtime graphic one is good, obtain fast image processing algorithm.
5, for the color segmentation problem of target image in the printing process of coloured image, to propose based on principal component analysis (PCA) and in conjunction with the new images color segmentation algorithm of classical image processing algorithm, there is built-in antinoise filter capacity, auto Segmentation can be carried out to the color of targeted color printing images and profile.
6, can small investment, that reduces printing machine initially joins black regulating time, conveniently detects Realtime Alerts, reduces waste product, and improve quality, the method is widely applicable, operation cost is low, is conducive to promoting.
Accompanying drawing explanation
Fig. 1 is printing machine image Cleaning Principle block diagram.
Fig. 2 is isochronous controller composition structural drawing.
Fig. 3 is printing machine image-detection process activity diagram.
Fig. 4 is new printing images color segmentation algorithm.
Embodiment
Below in conjunction with specific embodiment, the invention will be further described.
Printing machine pattern on-line checkingi described in the present embodiment and the method for color segmentation, first, the industrial tablet computer and lighting source with communication and image-capable need be configured with, and at the end of printing process, proximity transducer and industrial camera are installed, when complete printing finished product arrives, triggering industrial camera is taken pictures, and obtains printing finished product image, and this image is passed to industrial tablet computer, picture shape and color segmentation process is carried out in industrial tablet computer, to adopt based on principal component analysis (PCA) (PCA) and in conjunction with the new images color segmentation algorithm of existing Segmentation of Color Image, this algorithm is: first utilize PCA algorithm to be main characteristic component (having the perspective view of larger eigenwert) and residual characteristic component (being mainly the textural characteristics of image) two component map picture breakdown, then secondary watershed algorithm is adopted to split residual characteristic component figure, utilize K-Means algorithm to carry out cluster to main characteristic component figure just to split, then the image after just splitting cluster carries out analogous color area merges, finally the carrying out of two component map after segmentation is merged, obtain final segmentation result figure, then after the image after Real-time segmentation and the standard picture be stored in industrial tablet computer being contrasted, obtain printing realtime graphic and the difference of standard picture in shape and color, for follow-up printing quality fault diagnosis and color density control to provide foundation in real time.In order to ensure printing process, camera takes pictures and synchronous between computer disposal three, devise isochronous controller, isochronous controller is communicated with industrial tablet computer by RS422 communication interface, obtains image processing software duty and camera status is informed image processing software; Isochronous controller is by printed matter proximity state in proximity transducer perception printing process, and the duty of combining image process software determines that whether triggering camera takes pictures; Isochronous controller triggers camera by the I/O way of output and takes pictures, and obtains camera duty, and camera duty is informed image processing software by RS422 mode by I/O input mode; Isochronous controller controls lighting source by power switch circuit; Industrial camera adopts 1000M Ethernet to communicate with industrial tablet computer, realizes image data transmission; In order to improve image acquisition and image processing speed, have employed multi-thread mechanism and making industrial tablet computer and industrial camera concurrent working, in conjunction with synchronization mechanism, with applicable different printing machine type and different printing speed.
As shown in Figure 1, described industrial tablet computer adopts the Duo double-core industrial panel computer PPC-177T grinding China (Advantech), have 1000M Ethernet and RS422 interface, frequency of operation, up to 2.16MHz, meets required communication and image-capable; Industrial camera adopts the colored industrial camera SXG21C of fort alliance (Baumer), has 1920 × 1080 resolution; Lighting source is D65 standard sources, controls lighting source by isochronous controller by power switch circuit.Isochronous controller, by the arrival of proximity transducer perception printing finished product, is communicated with industrial tablet computer (IPPC) by RS422, realizes the synchronous of industrial camera and IPPC; Isochronous controller triggers industrial camera and takes pictures and obtain industrial camera by exporting I/O and to take pictures done state signal.Industrial tablet computer is communicated with industrial camera by 1000M Ethernet, obtains the running parameters such as printed matter view data, the Time delay arranging industrial camera and time shutter.
Fig. 2 is isochronous controller composition structural drawing, and the running parameter configuration and the Computer IP PC that receive IPPC allow shooting trigger signals.The running parameters such as before being sent in printing process, industrial tablet computer is initial synchronization controller and industrial camera first, the triggered time between configuration printing finished product arrives and takes pictures, standard sources opened by isochronous controller.In printing process, isochronous controller is by the arrival of its proximity transducer perception printing finished product, and the single chip circuit of isochronous controller adopts the STM32F100C8 based on Cortex-M3 kernel.
Fig. 3 is printing machine image-detection process activity diagram; Be made up of flat computer of the same trade or business, isochronous controller, industrial camera and printing process 4 active agents, Fig. 3 gives the message between the signal stream of body interior and main body, adopts the method for designing of activity diagram to process the synchronized relation of main body time preferably.When complete printing finished product arrives, isochronous controller is by the arrival of its proximity transducer perception printing finished product; Isochronous controller is communicated with industrial computer by RS422 communication interface, obtains image processing software duty and camera status is informed image processing software; Isochronous controller is by printed matter proximity state in proximity transducer perception printing process, and the duty of combining image process software determines that whether triggering camera takes pictures; Isochronous controller triggers camera by the I/O way of output and takes pictures, and obtains camera duty, and camera duty is informed image processing software by RS422 mode by I/O input mode; Industrial camera adopts 1000M Ethernet and compunication, realizes image data transmission.Have employed multi-thread mechanism and make computing machine and camera concurrent working, in conjunction with synchronization mechanism, improving image acquisition and image processing speed, make to be applicable to different printing machine type and different printing speed.
Fig. 4 is new printing images color segmentation algorithm, the Color Picking to finished figure picture after printed image (original template image) and printing processing and region segmentation can be realized, this is the prerequisite (under a few cases, standard image color provides, if standard picture designs on computers voluntarily) realizing the configuration of automatic coloured ink and color density control.Include abundant color and profile and textural characteristics in printing images, meanwhile, obtain image unavoidably containing noise by imaging device, partitioning algorithm must have good filtering ability to noise.Typical image segmentation algorithm respectively has relative merits, is used alone and can not be applicable to printing images segmentation.Such as, there is the problem being subject to noise and isolated point impact in K-Means algorithm; The graded of watershed algorithm to image is very sensitive, may be used for the printing images segmentation of color gradual transition, but easily causes over-segmentation; Based on the partitioning algorithm of graph theory, because needs manually participate in determining prospect and background, do not meet the requirement of auto Segmentation; Also there is the defect that Seed Points manually determined by needs in the partitioning algorithm based on region growing and regional merge and split.For in the printing process of coloured image, the color segmentation problem of original image, proposes Based PC A (principal component analysis (PCA)) and in conjunction with the new partitioning algorithm of other representative color image partition method.STEP401 is the input of chromatograp image, carries out the picture breakdown that STEP402 completes PCA algorithm afterwards; First this algorithm utilizes PCA algorithm to be main characteristic component and residual characteristic component two component map picture breakdown, and finally remaining is white Gaussian noise, rejects in fusion process, therefore has built-in noise removal capability; Two component images after decomposition provide most suitable condition to the application of classic algorithm, have played the advantage of dissimilar algorithm, have avoided its shortcoming; On the basis of decomposing, STEP411 utilizes K-Means algorithm to carry out cluster to main characteristic component figure just to split, STEP421 adopts secondary watershed algorithm to split residual characteristic component figure, secondary watershed algorithm is on the basis of first watershed segmentation figure, morphology make and break is done to the gradient map after segmentation level and smooth, and then carry out second time watershed segmentation, finally carry out suitable zonule to the result of two secondary ridges and merge, the method solves the problem of over-segmentation preferably; Then the image after just splitting cluster carries out analogous color area merges STEP412 and STEP422; Finally two component map of often kind of color after segmentation are carried out fusion STEP403 again, obtain the final segmentation figure being obtained original image by STEP404.Due to the printable color limitednumber of image in actual printing process, the classification number K value during K-Means calculates is taken as the actual printing color upper limit.If the actual color kind of original image is greater than the upper limit, then show that this chromatic printing machine can not complete the print job of original image, need replacing repeatedly to print on same printing machine the color more printing machine of red ink paste used for seals or adopt.If image actual color kind is less than the upper limit, then, after just segmentation, also may there is the close region of color in image, therefore also need the fusion carrying out Similar color region.
The examples of implementation of the above are only the preferred embodiment of the present invention, not limit practical range of the present invention with this, therefore the change that all shapes according to the present invention, principle are done, all should be encompassed in protection scope of the present invention.
Claims (3)
1. the method for a printing machine pattern on-line checkingi and color segmentation, it is characterized in that: first, the industrial tablet computer and lighting source with communication and image-capable need be configured with, and at the end of printing process, proximity transducer and industrial camera are installed, when complete printing finished product arrives, triggering industrial camera is taken pictures, and obtains printing finished product image, and this image is passed to industrial tablet computer, picture shape and color segmentation process is carried out in industrial tablet computer, to adopt based on principal component analysis (PCA) PCA and in conjunction with the new images color segmentation algorithm of existing Segmentation of Color Image, this algorithm is: first utilize PCA algorithm to be main characteristic component and residual characteristic component two component map picture breakdown, then secondary watershed algorithm is adopted to split residual characteristic component figure, utilize K-Means algorithm to carry out cluster to main characteristic component figure just to split, then the image after just splitting cluster carries out analogous color area merges, finally the carrying out of two component map after segmentation is merged, obtain final segmentation result figure, then after the image after Real-time segmentation and the standard picture be stored in industrial tablet computer being contrasted, obtain printing realtime graphic and the difference of standard picture in shape and color, for follow-up printing quality fault diagnosis and color density control to provide foundation in real time, in order to ensure printing process, camera takes pictures and synchronous between computer disposal three, devise isochronous controller, isochronous controller is communicated with industrial tablet computer by RS422 communication interface, obtains image processing software duty and camera status is informed image processing software, isochronous controller is by printed matter proximity state in proximity transducer perception printing process, and the duty of combining image process software determines that whether triggering camera takes pictures, isochronous controller triggers camera by the I/O way of output and takes pictures, and obtains camera duty, and camera duty is informed image processing software by RS422 mode by I/O input mode, isochronous controller controls lighting source by power switch circuit, industrial camera adopts 1000M Ethernet to communicate with industrial tablet computer, realizes image data transmission, in order to improve image acquisition and image processing speed, have employed multi-thread mechanism and making industrial tablet computer and industrial camera concurrent working, in conjunction with synchronization mechanism, with applicable different printing machine type and different printing speed.
2. the method for a kind of printing machine pattern on-line checkingi according to claim 1 and color segmentation, it is characterized in that: described industrial tablet computer adopts the Duo double-core industrial panel computer PPC-177T grinding China, have 1000M Ethernet and RS422 interface, frequency of operation is up to 2.16MHz; Described industrial camera adopts the colored industrial camera SXG21C of fort alliance, has 1920 × 1080 resolution; Described lighting source is D65 standard sources, controls lighting source by isochronous controller by power switch circuit; Described isochronous controller, by the arrival of proximity transducer perception printing finished product, is communicated with industrial tablet computer by RS422, realizes the synchronous of industrial camera and industrial tablet computer; Described isochronous controller triggers industrial camera and takes pictures and obtain industrial camera by exporting I/O and to take pictures done state signal; Described industrial tablet computer is communicated with industrial camera by 1000M Ethernet, obtains printed matter view data, the Time delay arranging industrial camera and these running parameters of time shutter.
3. the method for a kind of printing machine pattern on-line checkingi according to claim 1 and color segmentation, it is characterized in that: shooting trigger signals allowed by running parameter configuration and the computing machine of described isochronous controller reception industrial tablet computer, receive running parameter before printing process, described industrial tablet computer is initial synchronization controller and industrial camera first, these running parameters of triggered time between configuration printing finished product arrives and takes pictures, lighting source opened by isochronous controller; In printing process, isochronous controller is by the arrival of its proximity transducer perception printing finished product, and the single chip circuit of isochronous controller adopts the STM32F100C8 based on Cortex-M3 kernel.
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| CN109664611A (en) * | 2018-12-12 | 2019-04-23 | 浙江新中商务印刷有限公司 | A kind of printing machine |
| CN109709107A (en) * | 2019-02-12 | 2019-05-03 | 上海深视信息科技有限公司 | A kind of passenger vehicle tyre equalization point identifying system |
| CN111046903A (en) * | 2019-10-30 | 2020-04-21 | 东莞市宇环纸品包装材料有限公司 | Printed matter graph inspection method, system and storage medium |
| CN111046903B (en) * | 2019-10-30 | 2023-06-02 | 东莞市宇环纸品包装材料有限公司 | Printed matter graph inspection method, system and storage medium |
| CN114677326A (en) * | 2022-02-15 | 2022-06-28 | 杭州印鸽科技有限公司 | Device, system and method for detecting surface flaws of printed mobile phone shell based on machine vision and deep learning |
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